Calandria casing with telescopic sections



Dec. 16, 1952 A. H. LINDQUIST CALANDRIA CASING WITH TELESCOJPIC SECTIONS Filed March 12, 1949 2 SHEETS-Sl-IEET l INVENTOR. flLF/H-ID H. Lumpy/s7 HTI'OQNEFS Dec. 16, 1952 A. H. LINDQUIS'T 2,621,902

CALANDRIA CASING WITH TELESCOFIC SECTIONS Filed March 12, 1949 2 SHEETS-Sl-IEET 2 INVENTOR. flLFRED L/Amw/sr gwav vixi Patented Dec. 16,1952

RATIELNTP QFFI'CE i CALANDR-IACA'SING WITHJELESGOPIC- g V SECTIONS..

Alred.:H2 Lindquist; :Birmingham; Ala; assignor tcr :-Gos-lin .-Birmingham Manufa'cturing :Comw pany, Inc., a corporationzofsAlahamaa Application March 12, 1949, Serial No. 81,057.

1 Claim. 1

This inventionrelates to evaporators, and more particularly to the calandria or steam chest thereof and has for its principal object the provisionof-means giving ready access to-the calandria tubes for cleaning.

As is well known in the artto which my invention relates, the tubes of evaporators are likely to foul due to scale formation or the accumulation of scale and-foreign matter carried 'over with the vapor from one effect to another. While access to the interiors of the tubes for cleaning is afforded by removing the liquor box at one end of the evaporator, the only access to the exterior of the tubes, as heretofore known to me, has been by way of manholes in the calandria shell which gave only partial access to the tubes. In accordance with my invention, I have overcome this difliculty by providing the calandria shell with a telescoping detachable section which is joined to the main section of the shell and to one of the tube sheets. Whenever the tubes require cleaning on the outside, the detachable section may be detached from the tube sheet and from the main section of the shell and telescoped over the main section, thereby giving free access to the outside of the tubes for cleaning.

While not limited thereto, my invention is especially applicable to the long vertical tube type evaporator. Whenever the tubes are to' be cleaned it is contemplated that they will first be treated with a suitable solution to cause the scale and foreign matter to settle to the lower end of the calandria, after which the detachable section is moved up over the main section andthe accumulation of foreign matter in the lowerLend of the calandria is washed out.

An evaporator including my improved invention is illustrated in the accompanying drawings, forming a part of this application, in which:

Fig. 1 is an elevational view of the evaporator;

Fig. 2 is an. elevational view, partly in section, of the calandria, drawn to a larger scale'than Fig. 1;

Fig. 3 is a sectional view taken along the line III-III of Fig. 2;

Fig. 4 is a detail sectional view showing the Joint between the main section of the calandria shell and the detachable section; and,

Fig. 5 is an exploded view, partly in section, of the lower end of the calandria showing the separation of the sections of the shell to give access to the tubes for cleaning.

Referring now to the drawings for a better understanding of my invention, I show in Fig. 1 a

2* well -:lmown form "of evaporator including a vapor -body, or chamber I 0, which discharges" its vapor-into a catchall il through a conduit-"12. Connected to the lower" end of the vapor body I'D is-the calandria, or steam chest, which, in

accordance with my invention, comprises a cylindrical shell made up of a main section l3 having an enlarged upper end M to which steam is admitted for-heating through an-inlet |6.- A baffle l1 inside the enlarged section I4 causes the steam to be distributed evenly around the upper end of the calandria. Mounted in the upper end of the calandria is an upper tube sheet l8 and in the lower end a lower tube sheet I9, the tube sheets being connected by a plurality of tubes 2|. On the lower end of the main section I 3 of the steam chest is an out turned flange 22, which is preferably formed from separate metal stock rolled to shape and welded to the shell I3 as shown in Fig. 4. Extending downwardly from the main section I3 of the calandria shell is a larger diameter, detachable section 23. The upper end of the detachable section 23 is provided with an inturned flange 26 which overlaps the out turned flange 22 on the section 3, the flanges being secured together in fluid tight relation by suitable fastening means such as the cap screws 21. The detachable section 23 is provided with the usual condensate outlet 24. The lower end of the detachable section 23 is provided with an out turned flange 29 which overlaps the outer perimeter of the lower tube sheet I9. Mounted beneath the detachable section 23 is a liquor box 3| having an out turned flange 32 at the upper end thereof of the same diameter as the flange 29 on the detachable section and the lower tube sheet IS. The detachable section 23, the lower tube sheet l9, and the liquor box 3| are secured together by means of bolts 34 which extend through the flanges 29 and 32 and the outer perimeter of the lower tube sheet l9. Liquor to be evaporated is introduced into the liquor box 3| through an inlet 36.

The main section I3 of the calandria shell is provided with diametrically opposed lifting lugs 31 and the extension 23 is provided with corresponding lifting lugs 38. Whenever it is desired to have access to the lower ends of the tubes 2| for cleaning, the cap screws 2'! and the bolts 34 are removed, as shown in Fig. 5 of the drawing, and lifting means such as the blocks and tackle 39 and 4| is connected to the lifting lugs 31 and 38 and the detachable section 23 is raised, telescoping over the main section |3 of the calandria shell. At the same time, the liquor box 31 being removed, access is had to the exterior of the tubes 2| for cleaning.

In the cleaning of an evaporator constructed in accordance with my invention, it is assumed that the usual practice will be followed of boiling out the calandria with some solvent solution to loosen the scale and incrustation on and in the tubes, and allowing the impurities on the outsides of the tubes to settle down on the lower tube sheet [9 as indicated by the dotted line 42. With the sections 23 telescoped up over the main section 13 of the calandria shell, it will be seen that the impurities may then be readily washed off the tube sheet I9 and from around the tubes 2| From the foregoing it will be apparent that I have devised an improved calandria construction which is simple of design and easy of manufacture, and one which gives ready access to the tubes of the calandria for cleaning.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are specifically set forth in the appended claim.

What I claim is:

In a vertically disposed calandria including upper and lower tube sheets with connecting tubes, a cylindrical shell enclosing the tubes, said shell being shorter than the tubes and having an out turned flange at the lower end thereof, a shell extension telescoping upwardly over said cylindrical shell to give access to the exterior of the tubes and having an inturned flange overlapping the out turned flange and detachably connected thereto, an out turned flange on the extension overlapping the lower tube sheet, a liquor box having an out turned flange underlapping the lower tube sheet and the out turned flange on the extension, and detachable fastening means extending through said flanges and the lower tube sheet.

ALFRED H. LINDQUIST.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 240,220 Ashcroft et a1 Apr. 19, 1881 1,787,086 Pew, Jr Dec. 30, 1930 1,832,637 Kirgan Nov. 17, 1931 2,003,815 Worn June 4, 1935 2,102,723 Kotzebue Dec. 21, 1937 2,363,526 Hobbs Nov. 28, 1944 

